At home teeth whitening techniques mostly use the same ingredients and methodology as are used by dentists in their offices for hundreds of dollars. These same products can be purchased from other sources for a fraction of that cost. The ingredients in the tooth whitening systems that can be used safely at home contain the same 22% solution. These at home tooth whitening systems do not require lengthy treatment sessions – just fifteen to thirty minutes per day. The number of days the tooth whitening system can be used depends on the amount of whitening the customer prefers to have on his/her teeth.